1. Let the blue cheese and butter stand in a small bowl at room temperature about 30 minutes.
2. Mash with a fork till well combined. Stir in cream sherry and chopped walnuts.
3. Top each slice of bread with a pear slice and each pear slice with 1 tablespoon of blue cheese mixture.
4. Place bread slices on a baking sheet. Broil 4-5 inches from heat about 2 minutes or until the cheese is melted and bubbly.